564781 has 4 divisors (see below), whose sum is σ = 645472. Its totient is φ = 484092.

The previous prime is 564779. The next prime is 564793. The reversal of 564781 is 187465.

564781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 187465 = 5 ⋅37493.

It is not a de Polignac number, because 564781 - 2¹ = 564779 is a prime.

It is a super-2 number, since 2×564781² = 637955155922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40335 + ... + 40348.

It is an arithmetic number, because the mean of its divisors is an integer number (161368).

2⁵⁶⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

564781 is a deficient number, since it is larger than the sum of its proper divisors (80691).

564781 is an equidigital number, since it uses as much as digits as its factorization.

564781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80690.

The product of its digits is 6720, while the sum is 31.

The square root of 564781 is about 751.5191281664. The cubic root of 564781 is about 82.6596114195.

The spelling of 564781 in words is "five hundred sixty-four thousand, seven hundred eighty-one".